Listeroid water pump/Alternator Pulley Set Screws

[veggie]

I originally utilized the stock 5" single belt water pump pulley on my Listeroid to drive an oil pump.

I now want to use this pulley to drive a 24 volt alternator at 50 amps load (or 1200 watts... or 1.2kw....or 1.6HP)

My concern is that this pulley is attached to the crankshaft by two 3/8" set screws (no keyway or flat spot on the shaft)  
The set screws were adequate for driving the 1/8 HP needed by the oil pump, but the demand from this new alternator can reach 1.6HP .
I am wondering if anyone has experience driving anything like this with their Listeroid auxiliary pulley ?

Can two set screws adequately take the 1.6HP load/torque ?

Not a great picture, but the one below illustrates the location and current use for this pulley...

thanks
veggie

[Tom]

How are you going to get the RPM's the alt needs off of that 5" pulley? It would probably be best to run a serpentine belt over the flat of the flywheel.

[veggie]

How are you going to get the RPM's the alt needs off of that 5" pulley? It would probably be best to run a serpentine belt over the flat of the flywheel.

Not a standard alternator. It makes 50 amps at 900 rpm.
The small 6 inch water pump pulley is the perfect size.

[Tom]

Oh. Is perhaps one of the set screws into the key way on the crankshaft? If not get one of these type set screws and drill through the hole into the crank.

http://www.mcmaster.com/#92845a175/=sh7g2t

[veggie]

Thanks Tom.
Those would work.
Hmmmm.... drilling a hole through the crank on the engine side of the flywheels is a bit scary for me.
I Don't want to make the crank any weaker than it is.
Perhaps just drilling a recess the same depth as the point on the set screw is the answer.
Could that create a weak spot (break point) ?

Veggie

[Tom]

A through hole is not needed, just a .250" x .100" deep pocket for the dog to engage with. I don't think that will cause any weakening or stress points.